Results 21 to 30 of about 1,204 (263)
Science Progress, 2020 To solve the problems that the borehole depth is shallow and the drilling efficiency is low during the gas drainage drilling in soft coal seam with current cuttings removal method, a new technology of reverse circulation pneumatic cuttings removal is ...
Xiaoming Han
exaly +2 more sources
, 1964 Reverse-circulation drilling is designed specifically for the construction of production water wells, but is readily adaptable to soil exploration uses, foundation projects, and underwater drilling. The method is an adaptation of the dredge to vertical holes, which permits construction of moderate to large diameter holes of any depth to several hundred
core +2 more sources
Journal of Marine Science and Engineering, 2022 Ice core drilling with air reverse circulation is a promising technology that uses high-speed airflow to transport the ice core from the bottom of the hole along the central passage of the drill pipe to the surface.
Mengke Wang +5 more
doaj +2 more sources
Development and application of power head for CBM vehicle mounted drilling rig [PDF]
E3S Web of ConferencesIn order to meet the construction needs of surface coalbed methane extraction holes, cable holes, and mine surface rescue holes, a multifunctional power head suitable for coalbed methane vehicle mounted drilling rigs has been developed.
Liu Qi
doaj +2 more sources
Mechanical drilling of glaciers with bottom-hole scavenging with compressed air
Лëд и снег, 2022 Forecasting of the Earth's climate change is important for many spheres of human activity but this cannot be successful without reliable paleoclimatic information, an important source of which is the ice core material obtained during drilling of glaciers.
A. V. Bolshunov +4 more
doaj +3 more sources
Pressure distribution and fluid migration law of gas lift reverse circulation well washing flow field in drilling sinking [PDF]
Meitan kexue jishuIn order to reveal the pressure distribution and fluid migration law of the gas lift reverse circulation washing flow field in drilling method, the ø5m advanced drilling of the north wind well in Taohutu coal mine was taken as the research background ...
Longhui GUO +5 more
doaj +2 more sources
Principles of selection ofdrilling mud stream volume when drilling with a stream pump [PDF]
Acta Montanistica Slovaca, 2006 The reverse mud circulation induced by a stream pump is most frequently applied for large diameter drilling. This system is treated as auxiliary in all design solutions.
Jan Macuda, Andrzej Gonet
doaj +1 more source
Parametrical design and optimization of a reverse circulation drill bit for dust control
Frontiers in Built EnvironmentThe reverse circulation down-the-hole air hammer drilling (RC-DTH) method is renowned for its efficiency in hard rock formations and exceptional dust control performance.
Liming Fan, Zhilin Li, Yongjiang Luo
doaj +2 more sources